This is quite an old piece, from my art college days. The composition is adapted from a photograph of the roof of a dilapidated building, exposed beams were silhouetted against grey skies. Layers of compressed charcoal and graphite were repeatedly worked to become dense, then the cross or crane like form was erased from the black.
The cross shape and the title are deliberately ambiguous and open to interpretation, like most of my work. Author and friend Dr Peter Rollins now owns the piece, I think he found it resonated with some of his thought.
John Macormac 
Excellent picture.
thanks Rabirius, much appreciated.
It has a lot of depth. Very cool.
Thanks very much Syncopated Eyeball, yeah I find the more layers the greater depth can be achieved.
Artful.
Thankyou FlutePlayer
Celtic cross squared.
Compelling and provoking. It leads my mind in different directions all at once.